שמע ישראל ה' אלהינו ה' אחד
فمن كان يرجوا لقاء ربه فليعمل عملا صالحا ولا يشرك بعبادة ربه أحدا




Oct 14, 2010

Visible & Invisible

Posted By Snow at 10/14/2010

Visible light is the rainbow part in the Electromagnetic Spectrum | video

I have worked with lighting - it is a process to give color, shine & shadow in a movie like Toy Story. This process uses math to figure out the colors that will be seen on things. يتفيأ ظلاله [Q16:48]

With light, we can see things. الحمد لله

The Visible Light

We can see things when there is light. Light is actually an electromagnetic spectrum (EM). & our eyes have the ability to detect a very small part inside this EM spectrum - it is the rainbow part - so we see light as rainbow. We see light as the colors of the rainbow.

Say, when you look at a tree. What happens is, light from that tree goes to your eyes. Then your eyes & brain process the colors of that light - as an image of that tree in your mind.

When you look in the mirror, the light from you goes to the mirror, and the mirror reflects the exact same light back to your eyes. Then your eyes & brain process the colors of that light - as an image in yourself in your mind.

Light Travels

By now you should understand that light travels, it travels from things to your eyes. The speed of light is the fastest known in the universe - 186,000 miles per second - it can circle the Earth 7.5 times in a second. It's like the universe's speed limit.

Darkness

So, what will happen when there is no light traveling around? As there is no light coming to your eyes - your eyes do not process any light - so you see nothing, only darkness. وآية لهم الليل نسلخ منه النهار فإذا هم مظلمون [Q36:37]

Like this tree, it blocks the light so there is darkness in the area without light. Darkness is the absence of light. ومن لم يجعل الله له نورا فما له من نور [Q24:40]

Illusions

But on a funny occurrence, when there is light but it travels in a bended way, you can see things that does not exist. Light travels straight, but it can be bended. Like a mirage. It happens when the light bends as it travels between cold & warm air. This bending produces a displaced image - so you see water that does not exist, bcoz of the blueness from the sky. كسراب بقيعة يحسبه الظمآن ماء حتى إذا جاءه لم يجده شيئا [Q24:39]

The Invisible

All the things that we can see, thanks to the rainbow colors of light, is called visible light - which is actually a very small part inside the EM spectrum. There are other spectrums around - radiowaves, microwaves, infra red, ultra violet, x-rays, gamma rays - which are invisible.
You use these invisible spectrum when you listen to the radio, watch TV, use your handphone, surf the internet, remote lock your car etc. So the invisible exists, it's around us & it's HUGE. If you had a reel of movie film stretching 2,500 miles, the visible spectrum is only one tiny frame - the rest is invisible. [video] So just bcoz you don't see it, doesn't mean it's not around you. ماشاء الله

Muslims has a term called ghaib (غيب) - unseen & unknown. It is true.

اعوذب لله من الشيطان الرجيم
إن الله يعلم غيب السماوات والأرض والله بصير بما تعملون

Indeed, Allah knows the unseen (aspects) of the heavens and the earth.
And Allah is Seeing of what you do.
[Holy Quran 49:18]

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1 comments on "Visible & Invisible"

Snow on Mar 23, 2013, 1:48:00 PM said...

Sound wave is also invisible. I think they use sound waves for scanning pregnancy (ultrasound). The machine sends sound pulses into the body, & when it hits a boundary (tissue, bone etc) it echoes back. The distance & intensity of the echoes are displayed on the screen as a 2D image. [ref]

Sound wave is different from EM bcoz sound waves needs air to travel. This means, you can't hear much in space, but you can detect EM. [ref] والله أعلم


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